2003 2500 HD GMC Sierra will only run at 1500 rpm or higher, no idle. Not throwing any codes.

Asked by Allison Jun 11, 2018 at 02:15 PM about the 2003 GMC Sierra 2500HD Crew Cab LB HD

Question type: Maintenance & Repair

2003 2500 HD GMC Sierra will only run at 1500 rpm or higher, no idle. Not
throwing any codes. Cleaned throttle body & replaced, same issue. Checked
fuel pressure, all good. Does smell heavy of gas after keeping the engine
going for a few minutes. Replaced one bad coil, but also did not solve issue.
Can not find any vacuum leaks. Kind of at a loss as to what it might be at this
point, will take any and all suggestions at this point!

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